Searched hist:10890 (Results 1 - 2 of 2) sorted by relevance
| /gem5/src/mem/ | ||
| H A D | dram_ctrl.hh | diff 10890:bac38d2a4acb Fri Jul 03 10:14:00 EDT 2015 Wendy Elsasser <wendy.elsasser@arm.com> mem: Update DRAM command scheduler for bank groups This patch updates the command arbitration so that bank group timing as well as rank-to-rank delays will be taken into account. The resulting arbitration no longer selects commands (prepped or not) that cannot issue seamlessly if there are commands that can issue back-to-back, minimizing the effect of rank-to-rank (tCS) & same bank group (tCCD_L) delays. The arbitration selects a new command based on the following priority. Within each priority band, the arbitration will use FCFS to select the appropriate command: 1) Bank is prepped and burst can issue seamlessly, without a bubble 2) Bank is not prepped, but can prep and issue seamlessly, without a bubble 3) Bank is prepped but burst cannot issue seamlessly. In this case, a bubble will occur on the bus Thus, to enable more parallelism in subsequent selections, an unprepped packet is given higher priority if the bank prep can be hidden. If the bank prep cannot be hidden, the selection logic will choose a prepped packet that cannot issue seamlessly if one exist. Otherwise, the default selection will choose the packet with the minimum bank prep delay. |
| H A D | dram_ctrl.cc | diff 10890:bac38d2a4acb Fri Jul 03 10:14:00 EDT 2015 Wendy Elsasser <wendy.elsasser@arm.com> mem: Update DRAM command scheduler for bank groups This patch updates the command arbitration so that bank group timing as well as rank-to-rank delays will be taken into account. The resulting arbitration no longer selects commands (prepped or not) that cannot issue seamlessly if there are commands that can issue back-to-back, minimizing the effect of rank-to-rank (tCS) & same bank group (tCCD_L) delays. The arbitration selects a new command based on the following priority. Within each priority band, the arbitration will use FCFS to select the appropriate command: 1) Bank is prepped and burst can issue seamlessly, without a bubble 2) Bank is not prepped, but can prep and issue seamlessly, without a bubble 3) Bank is prepped but burst cannot issue seamlessly. In this case, a bubble will occur on the bus Thus, to enable more parallelism in subsequent selections, an unprepped packet is given higher priority if the bank prep can be hidden. If the bank prep cannot be hidden, the selection logic will choose a prepped packet that cannot issue seamlessly if one exist. Otherwise, the default selection will choose the packet with the minimum bank prep delay. |
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